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SECTION II.  INSPECTING AND SERVICING THE EQUIPMENT
Figure 2-2.  Location of Master Drill Fixture

TM-55-1680-358-12P Survival Kit Overwater Individual (NSN 1680-00-973-1863) Manual
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TM 55-1680-358-12&P 2-7.  Aircraft Preparation.  Prepare the aircraft for safe ground maintenance as follows: a.  Cleaning.  Before attempting to install the Helicopter Internal Cargo Handling System, the floor of the aircraft should be cleaned of all dirt and debris. b.  Preparation.  After the floor has been cleaned, proceed as follows: NOTE Loading pole ground  able is secured to retaining brackets.  Detach the ground cable to aircraft in or near the same location. CAUTION Ensure loading pole grounding cable is outboard of outboard rail/roller assembly, stations 272.531 to 374.000 (3 and 4, Figure 3-2) at installation. (1)  Remove loading pole retaining brackets located at stations 327.680, 348.980 and 387.680 on right-hand side of aircraft (Figure 2-1) and discard brackets. (2)  Remove the aircraft ramp extensions from the ramp.  Locate the master drill fixture, Part No.  B 18049 140-MDF, over one of the ramp extensions, as shown in Figure 2-2.  Make sure the alignment pins are snug against the ramp extension.  Use at least two C- clamps to hold the fixture in position. CAUTION Drilled holes must be within tolerance, clean and free of burrs to ensure proper engagement of pins. (3)  Drill first two holes (0.396 to 0.403 inch diameter).  Drill one at each end, using the fixture drill guide holes (Figure 2-2). (4)  Repeat steps 2 and 3 for remaining ramp extension. Figure 2-1.  Loading Pole Retaining Bracket Locations 2-4







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